This is necessary in order not to confuse the vacation logic

  names, added two new parameters

  to avoid error messages

  to include monthly, weekly _or_both_.

  membership in projects.

  a custom timesheet implementation

- Added a link to the headers of the weekly view to go to
  daily views

  - Now calculating the duration days of the absence taking into account
    user for whom the absence is created
  - Calculate duration calculation: All arguments are now checked.